From the same as pselaphao; a pebble (as worn smooth by handling), i.e. (by implication, of use as a counter or ballot) a verdict (of acquittal) or ticket (of admission); a vote -- stone, voice.
KJV: Which thing I also did in Jerusalem: and many of the saints did I shut up in prison, having received authority from the chief priests; and when they were put to death, I gave my voice against them.
NASB: "And this is just what I did in Jerusalem; not only did I lock up many of the saints in prisons, having received authority from the chief priests, but also when they were being put to death I cast my vote against them.
KJV: He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the hidden manna, and will give him a white stone, and in the stone a new name written, which no man knoweth saving he that receiveth it.
NASB: He who has an ear, let him hear what the Spirit says to the churches. To him who overcomes, to him I will give some of the hidden manna, and I will give him a white stone, and a new name written on the stone which no one knows but he who receives it.'